Results 61 to 70 of about 1,274 (202)

Statistical Analysis of Atmospheric Ducts in the Yellow and Bohai Seas of China and Study of Their Electromagnetic Wave Propagation Characteristics

Atmosphere
Atmospheric ducts play a critical role in the propagation of electromagnetic waves by minimizing signal loss and extending transmission distances, which is essential for radar, communication, and navigation systems.
Xiao Yang, Lei Li, Leke Lin, Rui Zhang, Shuaishuai Liang, Zhenwei Zhao   +5 more
doaj   +1 more source

Effect of meteorological variables on evaporation duct height (EDH): A case study in Basra, Iraq

Journal of Agrometeorology
MUTHANNA A. AL-TAMEEMI, ALI RAHEEM AL-NASSAR, AQEEL GHAZI MUTAR   +2 more
doaj   +2 more sources

Verification and Validation of the Satellite Marine-layer/Elevated Duct Height (SMDH) Technique [PDF]

, 2000
This report is the verification and validation of the Satellite Marine-layer/Evaporation Duct Height (SMDH) technique under development by NAWC Point Mugu, California. The technique provides an estimate of the cloud-top height of stratocumulus clouds in
Philip A. Durkee, Durkee, Philip A., Mary S. Jordan, Jordan, Mary S.   +3 more
core   +1 more source

“Cold Tropics”: Permafrost Existence and Thickness on Eastern Nevado Coropuna (Southern Peruvian Andes) Revealed by Ground‐Penetrating Radar and Geoelectrical Soundings

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The existence of permafrost was explored at tropical latitude on Nevado Coropuna (southern Peruvian Andes) using a combination of ground‐penetrating radar (GPR) and vertical electrical sounding (VES) in order to strengthen the mutual validation of data processing and interpretation.
Velnia Chacca, Ramón Pellitero, Adriano Ribolini, José Úbeda, Luis Mariano del Río, Ricardo Vila, Oscar Vilca   +6 more
wiley   +1 more source

Implications for microwave radio path design of the evaporation duct over tropical oceans in northern Australia

, 2002
Examples of evaporation duct height statistics for coastal and oceanic waters in the North of Australia are presented. The range in duct height variation measured in coastal waters beckons further investigation of the effects of the evaporation duct on ...
Woods, G.S., French, G., Lensson, E., Kulessa, A.S., Kerans, A.   +4 more
core   +1 more source

Refractivity variations and propagation at Ultra High Frequency

Results in Physics, 2017
Present framework is established to deal with the refractivity variations normally affected the radio waves propagation at different frequencies, ranges and different environments.
I. Alam, M. Najam-Ul-Islam, U. Mujahid, S.A.A. Shah, Rizwan Ul Haq   +4 more
doaj   +1 more source

Assessing the role of urban blue space in summer outdoor thermal regulation in northwestern Europe: A hectometric Weather Research and Forecasting modelling on idealized urban landscape

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Using hectometric Weather Research and Forecasting simulations, we examine how urban blue spaces mitigate extreme summer heat in northwestern European cities through neighbourhood‐scale cooling mechanisms. Results show horizontal advection dominates cooling by mixing cooler air from waterbodies with warmer urban air, providing ∼50W·m−2$$ \sim 50\kern0 ...
Xuan Chen, Srinidhi Gadde, Arjan Droste, Gert‐Jan Steeneveld, Miriam Coenders‐Gerrits, Remko Uijlenhoet   +5 more
wiley   +1 more source

Spatial and temporal distributions of evaporation ducts in the Black Sea and their impact on the over-the-horizon propagation of electromagnetic waves

Frontiers in Marine Science
The evaporation duct is a critical factor in maritime electromagnetic wave propagation. It exhibits significant spatiotemporal variability influenced by regional meteorological dynamics.
Chongyang Feng, Chongyang Feng, Shuwen Wang, Chunlong Huang, Fan Yang, Yihang Shu, Kunde Yang   +6 more
doaj   +1 more source

Comparison of evaporation duct height measurement methods and their impact on radar propagation estimates [PDF]

, 1998
A study was performed to compare shipboard measurements of atmospheric parameters that impact the evaporation duct and its effect on the propagation of electromagnetic energy from the AEGIS AN/SPY-1 radars.
Whalen, John David
core  

Research on the Microwave Propagation in the Evaporation Duct with Obstacles

, 2011
The influence of the microwave propagation in the evaporation duct is studied by solving wide angle parabolic equation using Fast-Fourier transform method.
Li Xin Guo, Guang Cheng Li, Tian Tian Zhang   +2 more
core   +1 more source